| … | |
… | |
| 31 | |
31 | |
| 32 | =cut |
32 | =cut |
| 33 | |
33 | |
| 34 | package Coro::Semaphore; |
34 | package Coro::Semaphore; |
| 35 | |
35 | |
|
|
36 | no warnings qw(uninitialized); |
|
|
37 | |
| 36 | use Coro (); |
38 | use Coro (); |
| 37 | |
39 | |
| 38 | $VERSION = 0.45; |
40 | $VERSION = 0.52; |
| 39 | |
41 | |
| 40 | =item new [inital count] |
42 | =item new [inital count] |
| 41 | |
43 | |
| 42 | Creates a new sempahore object with the given initial lock count. The |
44 | Creates a new sempahore object with the given initial lock count. The |
| 43 | default lock count is 1, which means it is unlocked by default. Zero (or |
45 | default lock count is 1, which means it is unlocked by default. Zero (or |
| … | |
… | |
| 53 | =item $sem->down |
55 | =item $sem->down |
| 54 | |
56 | |
| 55 | Decrement the counter, therefore "locking" the semaphore. This method |
57 | Decrement the counter, therefore "locking" the semaphore. This method |
| 56 | waits until the semaphore is available if the counter is zero. |
58 | waits until the semaphore is available if the counter is zero. |
| 57 | |
59 | |
|
|
60 | =item $status = $sem->timed_down($timeout) |
|
|
61 | |
|
|
62 | Like C<down>, but returns false if semaphore couldn't be acquired within |
|
|
63 | $timeout seconds, otherwise true. |
|
|
64 | |
| 58 | =cut |
65 | =cut |
| 59 | |
66 | |
| 60 | sub down { |
67 | sub down { |
| 61 | my $self = shift; |
|
|
| 62 | while ($self->[0] <= 0) { |
68 | while ($_[0][0] <= 0) { |
| 63 | push @{$self->[1]}, $Coro::current; |
69 | push @{$_[0][1]}, $Coro::current; |
| 64 | Coro::schedule; |
70 | Coro::schedule; |
| 65 | } |
71 | } |
| 66 | --$self->[0]; |
72 | --$_[0][0]; |
|
|
73 | } |
|
|
74 | |
|
|
75 | sub timed_down { |
|
|
76 | require Coro::Timer; |
|
|
77 | my $timeout = Coro::Timer::timeout($_[1]); |
|
|
78 | |
|
|
79 | while ($_[0][0] <= 0) { |
|
|
80 | push @{$_[0][1]}, $Coro::current; |
|
|
81 | Coro::schedule; |
|
|
82 | $timeout and return; |
|
|
83 | } |
|
|
84 | |
|
|
85 | --$_[0][0]; |
|
|
86 | return 1; |
| 67 | } |
87 | } |
| 68 | |
88 | |
| 69 | =item $sem->up |
89 | =item $sem->up |
| 70 | |
90 | |
| 71 | Unlock the semaphore again. |
91 | Unlock the semaphore again. |
| 72 | |
92 | |
| 73 | =cut |
93 | =cut |
| 74 | |
94 | |
| 75 | sub up { |
95 | sub up { |
| 76 | my $self = shift; |
|
|
| 77 | if (++$self->[0] > 0) { |
96 | if (++$_[0][0] > 0) { |
| 78 | (shift @{$self->[1]})->ready if @{$self->[1]}; |
97 | (shift @{$_[0][1]})->ready if @{$_[0][1]}; |
| 79 | } |
98 | } |
| 80 | } |
99 | } |
| 81 | |
100 | |
| 82 | =item $sem->try |
101 | =item $sem->try |
| 83 | |
102 | |
| … | |
… | |
| 85 | otherwise return false and leave the semaphore unchanged. |
104 | otherwise return false and leave the semaphore unchanged. |
| 86 | |
105 | |
| 87 | =cut |
106 | =cut |
| 88 | |
107 | |
| 89 | sub try { |
108 | sub try { |
| 90 | my $self = shift; |
|
|
| 91 | if ($self->[0] > 0) { |
109 | if ($_[0][0] > 0) { |
| 92 | --$self->[0]; |
110 | --$_[0][0]; |
| 93 | return 1; |
111 | return 1; |
| 94 | } else { |
112 | } else { |
| 95 | return 0; |
113 | return 0; |
| 96 | } |
114 | } |
| 97 | } |
115 | } |
